Process for obtaining pure copper from a solution of copper.



UNITED STATES PATENT OFFICE.

Lucien JUMAU, or PARIS, FRANCE.

PROCESS FOR OBTAINING PURE COPPER FROM A SOLUTION OF COPPER.

Specification of Letters Patent.

' Patented April 7, 1908.

Application filed January 19, 1907. Serial No. 353,063.

To all whom "it may concern:

Be it known that I, Loom): J UMAU, citizen of France, residing at Paris, in the. said Republic, have invented new and useful Improvements in Metallurgical Processes for Obtaining Pure Copper from a Solution of Copper Prepared by any Known Method, (for which a French patent of addition, N. 6478 of July 11, 1906, has been obtained,) of which the followingis a specification.

invention relates to an improved process or obtaining pure metallic copper from a solution of salts of copper, and it consists J in-the steps and processes herein described and claimed.

- In the operation of my invention, an am -n1oniacal solution containing salts of copper is obtained as by leaching-the ores with an 'amrnoniacal solution. Such solution containing the co per salts is then treated with a suitable sul to, such as, for example, sulfite of hydrogen, commercially known as suliurous acid. In this step, the precipitate contains cuprous sulfite, usually in the form '5 of cuproso-cu ric sulfite. The said precipit te is then eated under pressure in the presence of an aqueous substance. The solution from which the precipitate has been tinown down can be satisfactorily employed 0 l to constitute the required aqueous substance,

or the precipitate can be separatedt'rornsaid solution and water supplied to provide the aqueous-substance.

. The final operation of the last step, omitting certain intermediate reactions, may be stated as follows:

begin between the tern eratures of 140 C. and 160 0., and to ecome nearly com:

pleted at 170 C. The process can, there :-5 tore, be co nv'enientlycarried out in any usual lead heed digester of copper or iron.

described he above described reaction is found to Witnesses:

The copper may be further refined, if desired, by any usual method, such as the electrolytic process.

I have illustrated a preferred and satisfactory process, but, obviously, changes could be made within the spirit and scope of my invention.

Having thus described In invention,iwhat 1 claim as new therein an desire to secure 56 by Letters Patent is: V

1.. The herein described process for 0htaining pure copper from an animoniacal so 7 lution containing salts of copper, which consists in treating said solution with a 'sulfitef 60 for precipitating copper compounds, and heating said precipitate under pressure the presence of an aqueous substance.

2. The herein described process for; obs taming pure copper-from enani'nionicalso- B5 lution containing salts of copper, which 0011- sists in treating said solution witheis'nlfite, of hydrogen for precipitatingcoppergjcom pounds, and beat-mg said precipitatejunder'- Q pressureintho presence0f'Wate1T.- j 170 3. The herein describedprocessiorob' taining pure copper from an ammoniacal' so: lution containing salts of copper, consists in treating said solutionfwitb"appljite" for precipitating coppercompounds; d}; heating said precipitate b l 180310; an

pressure-in t'e presence'of an aqueousfsubstance; v v

4. The herein rdescribed process or ob taining' pure copper from an'ammoniac'al isolution' containing salts ofcopper, whiclifioon sistsfin treating said solutionkwith alsulfite for precipitating lcopper compounds, and. he'atmgsaid preci itate'to a temperature-he tween C. an C: under pressure in 85 the presence of an aqueoussubstance- In testimoiiy whereof have signed my name to this-"specification the presence .of

two subscribingwitnesses; t

LUCIEN JUMAU.

JULE Fuentes, EUGENE Pianos. 

